In: Can be used for months, years, decades, centuries, seasons, and the future. Examples: 1.) I will go to university in September. 2.) I went to university in 1993. 3.) I went to university in the 1980’s. 4.) I went to university in the late 20th century. 5.) I go to university in the fall. 6.) I will go to the store in a few minutes. Note that this use of “in” is in the future, but it is for a shorter period than the other examples. At: Can be used for particular times. Examples: 1.) I will go to the store at 5:30. 2.) I go to the store every day at midday. 3.) I go to the store on Tuesdays at lunchtime. 4.) I go to the store at sunset. 5.) I go to the store at night.Note that we do not say “at day.” Instead, we say, “during the day.” 6.) I go to the store at Thanksgiving to buy enough food for the meal. 7.) British English usage: I go to the store at the weekend. American English would say, “on the weekend.”On: Can be used for days and dates Examples: 1.) I like to go to parties on Fridays. 2.) I am excited to go to the party on January 19.Reference:http://www.englishgrammarexpress.com/grammar/in-on-at-timeCheck out these sites for some online practice! Then try making your own sentences using these prepositions.http://www.perfect-english-grammar.com/time-prepositions-exercise-2.htmlhttp://www.englishexercises.org/makeagame/viewgame.asp?id=5278

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